The data indicates a builder with hands (and without tools!) that builds structures that primarily could not serve as practical shelters, and are primarily built from dead wood stripped of bark, and which form recognizable identifiable archetypes across the country. That's not a conclusion about the data, that's what the data is; I think the implication behind "blaming the data" is really that you're just not looking at it closely enough to see what it actually looks like.
The notion that no one has seen a sasquatch building a structure somehow places the theory in epistemological purgatory is a colossal cop-out; they are encountered in the vicinity of structures, and structures are found in the vicinity of encounters, connect the dots. That may not be universally true, perhaps it is a regional behavior, I don't know, but speaking from personal findings and experience in Colorado and the Midwest, they are the builders. Plenty more examples from all across the country are out there, I recommend spending some time on Youtube.